IMA mineral species
Mangano-ferri-eckermannite
NaNa₂(Mn²⁺₄Fe³⁺)Si₈O₂₂(OH)₂
Na-amphibole, double chain inosilicate mineral.
Properties
⛏ Mohs hardness4 – 6
💅🪙🍶🔪💎
Scratches glass; quartz scratches it.
🔷 Monoclinic✏️ streak brown
| Chemical formula | NaNa₂(Mn²⁺₄Fe³⁺)Si₈O₂₂(OH)₂ |
|---|---|
| Elements | Na, Mn, Fe, Si, O, H |
| Crystal system | Monoclinic |
| Mohs hardness | 4 – 6 |
| Density | — |
| Streak | brown |
| Color | — |
| Cleavage | {110} |
| IMA symbol | Mfeck |
| Nickel–Strunz class | 9.DE.25 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
🌍 Where it's found
Type locality (where it was first described): Tanohata mine, Japan
Learn more
- Mangano-ferri-eckermannite on Mindat.org
- Wikidata item Q3817799 (source of this page's data – you can correct it there)
IMA mineral species
4–5
Monoclinic